Characterizing Quantum Codes via the Coefficients in Knill-Laflamme Conditions

Mengxin Du, Chao Zhang, Yiu-Tung Poon +1

Quantum error correction (QEC) is essential for protecting quantum information against noise, yet understanding the structure of the Knill-Laflamme (KL) coefficients $\hat{I}{»}_{ij}$ from…